Electric lamp



Apfil 26, 1927.

G. vENTURlNl ELECTRI C LAMPl origina- 1 Filed Jan. 14. 1925 #Ianni Patented Apr. 2e, 1927.

PATEiNroFFic ijzasisi GUILLERMO VENTURINI, or SANTIAGO, CHILE.4

ELECTRIC LAMP.

Application led January 14, 1925, Serial No. 2,372. Rlmewed March 16, 192.7.

This inventionl relates to an .improved electric lamp, the general object of the insistances Awhich are all connected with asingle conductor and with manually operated mea-ns for connectingany filament with the second contact of the lamp.

This invention also consists in certain other features of construction and in the combination and arrangement of the several parts, to be hereinafter fully described, illustrated in the accompanying drawings and specifically pointed out in the appended claim. A

In describing myinvention in detail, reference will be hadto`v the accompanying drawings wherein like characters denote like or vcorresponding parts throughout the several views, and in which p Figure l -is a longitudinal sectional view V- through the improved lamp. s I

Figure 2 is a' section on line 2.-2 of Figure 1.

Fi n re 3 is a fragmentary plan view showing t e dial for. facilitating adjustment of the lamp. l

Figure 4 is a section on line 4-4 of Figure 1.

In these views, 1 indicates theglass body of the lampand 2 the insulation material which is enclosed by the metal shell 3 which is threaded to engage the usual socket member. The glass stem is shown at 4, and this stem supports four sets of arms 5. Each set of arms supports a filament 6 and the filaments have diii'erent resistances so that the candle power of the lamp can be varied by passing the current through .the different filaments. One end of each filament is connected to a conductor 7 which is connected with the central Contact 8 ofthe lamp and theother end of each filament is connected to a terminal 9. These terminals are .car-u ried by a tubular member 10 arranged-in the lamp and in which is rotatably mounted a post 11 which has al knob 12 at its upper end so that by turning the knob the post can be rotated in the tubular member. A con- .ductor rod 13 passes thro'u h the center of the post and a plurality o spring pressed contacts 14 are arranged in recesses 15 formed in the post with the springs 16 engaging the rod 13. One of these contacts 14 is arranged in the same plane-as each terminal 9 so that' when `the post is rotated the contact will engage the terminal and thus complete the circuit to the filament, the terminal 9 of which is engaged by the con- 'tact `14 through the contact, its spring', the

rod 13, the knob and the shell. The contacts 14 are arranged a quarter turn from each otherV and-the knob is provided with a'dial 17 so that the post can be turned to place the desired filament in the circuit.

From the foregoing it will be seen that I any desired filament can be placed in the circuit by turning the knob 12 to the proper position as indicated by the dial. Thus the lamp will giverof light of the desired. intensity, the drawings showing a lamp which can be made to give light-of four different candle powers. It will of course be understood that any desired number of filaments can be arran ed in the lamp.

' It is thong t' from the foregoing descrip tion that the advantages and novel features y formed therewith, said member being paral-vA lel with thejstem, a plurality of terminals carried thereby, each terminal .being connected with a Iilament,'a post formed ofv insulating material and rotatably mounted in the tubular member, a rod carried by the post,'spring contacts carried by the post and arranged to engage the 1terminals as the post is rotated,.the springs of the contact engaging the' rod, said rod being electrically connected with the second contact of .the lamp, a handle connected with the post land indicating means for indicating the position of the spring contacts.

In testimony whereof I ax my signature.

` eUmLEiiMo VENTURINI.

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